
1) Bass horn 2) Helicon 3) Sousaphone 4) Tuba
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https://www.crosswordclues.com/clue/bombardon

1) Bombard 2) Helicon
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https://www.crosswordclues.com/clue/bombardon

- a tuba that coils over the shoulder of the musician
- a large shawm; the bass member of the shawm family
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large keyless bass trumpet
Found on
http://phrontistery.info/b.html

• (n.) Originally, a deep-toned instrument of the oboe or bassoon family; thence, a bass reed stop on the organ. The name bombardon is now given to a brass instrument, the lowest of the saxhorns, in tone resembling the ophicleide.
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http://thinkexist.com/dictionary/meaning/bombardon/

The bombardon is now a large musical instrument of the saxhorn family, the lowest of the saxhorns, in tone resembling the ophicleide. The bombardon was originally, a deep-toned instrument of the oboe or bassoon family and then the term was also applied to a bass reed stop on the organ.
Found on
http://www.probertencyclopaedia.com/browse/VB.HTM

[
n] - a large shawm
Found on
http://www.webdictionary.co.uk/definition.php?query=bombardon
bombard noun a large shawm; the bass member of the shawm family
Found on
https://www.encyclo.co.uk/local/20974

a bass reed stop on a pipe organ. · a large, deep-toned, valved, brass wind instrument resembling a tuba.
Found on
https://www.infoplease.com/dictionary/bombardon
No exact match found.